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New-TenantAllowBlockListSpoofItems

Use the New-TenantAllowBlockListSpoofItems cmdlet to create spoofed sender entries in the Tenant Allow/Block List. Exchange PowerShell reference

From the Exchange PowerShell reference 7 parameters Its page in the reference

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Parameters

7 in the Exchange PowerShell reference
-IdentityThe Identity parameter uses the value Default.
-SendingInfrastructureThe SendingInfrastructure parameter specifies the source of the messages sent by the spoofed sender that's defined in the SpoofedUser parameter.
-SpoofedUserThe SpoofedUser parameter specifies the email address or domain for the spoofed sender entry.
-SpoofTypeThe SpoofType parameter specifies whether this is an internal or external spoofed sender entry.
-ActionThe Action parameter specifies whether is an allowed or blocked spoofed sender entry.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-WhatIf, -wiThe WhatIf switch doesn't work in Security & Compliance PowerShell.